Carbureter



H. L. THOMPSON.

CARBURETER. APPLICATION F|L n-APR.15, |918.

` I Patented July 6, 1920.,

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wUNITED STATES'PMENT OFFICE@ HERBERT L. THOMPSON, OF ELGIN, ILLNOIS,ASSIG'NR TO ELGIN GAS MOTR COMPANY, OF ELGIN, ILLINOS, A GORFORATIONOFILLINOIS.

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` at lillginyin the county oi ltane and Siate ot lllinois, have inventedcertain neuT and iisei'ul improvements in Carbureters, or

which the following is a specification. j

j j gas engines, and the principal object is toi .lid

i rlhis invention"relatesto a earbureter"for provide a simple device ofthis kind which has few parts, is easily accessible, and un likely toget out oit order. Another object lis to provide `a construction whichmay be easily primed in starting the engine. Other objects will appearhereinafter.

'lhe invention consists `in the novel construction combination andarrangement oi' the parts. 1

ln the accompanying drawing- Figure 1 is a sectional elevation )t ararbilireter and priming means constructed in accordance With theprinciple of the in* vention.

Fig. 2 is a sertional vievv taken on line 2-#2 oit Fig. 1; and

Fig. 3 is a detail viev7 oi' the end of the carbureter which is attachedto the engine.

"The carbureter proper comprises a casting member 1 in which is a mixingchamber 2 with. an internally threaded portion 3 at its upper end and anoutwardly rounding passage a at its lower end which is connected throughan opening 5 with the mani fold or engine to which it is applied.Perforated ears 6 are commonly provided as a part of the member 1 aboveand below the `opening 5 .tor attaching the carbureter to the partvvhich supportsit. Threaded in an upstanding boss 7, at the bottom oit`the chamber 2, is pin 8 which entends to the top of the chamber. In theupperendiof the portion 3 oi this chamber a sleeve 9 is threaded whichhas a beveled opening 10, at the bottom of which is a `valve 11 slidableon the pin 3 and substantially closing the beveled opening of the.sleeve. A spring 12 is interposed between the boss 7 and this valve l1tending to hold it against the bottom of the sleeve member. Thevariation in position of the sleeve member 9 ot course varies thepressure Which the spring 12 ex erts upon the valve.

At one side ol the chamber 2 is a recep tacle 13 with its bottom belowthe bottoni oit the chamber 2, and with. an open top Specification orLetters Patent.

Patented duly 6, 1220..

Application inea april 15,1918. seriai No. 228,520.

1i above the bottom o1 the chamber 2. At one side of the chamber 2 is aprojection 1l in which is a passage 15 extending below `l5 and thebottom `of the receptacle 13 `is `a passage 16. The upper end of thepassage 15 is `Within the chamber 2 and above the open top. ot' thereceptacle 13 so that any liquid introduced into the passage 15 wouldfirst `lill the receptacle 13 and would overflow 'from the top of thisreceptacle Without entering the chamber 2.

1 Extending into the passage 15, above the bottom of the chamber 2, is aneedle valve passage 17 with a narrow portion 18 adjacent the passageand with a threaded por tion 19`at some distance therefrom. In thispassage a needle valve 20 is inserted which has a pointed end 21 to`close the narrow portion 18, a threaded portion 22 fitting the`tlnfeads `19, and a bent extremity 23 at the outer end bymeans of Whichit is easily rotated and adjusted. A packing gland 2t surrounds theneedle stem Where it emerges from the member l. and acts upon packingmaterial 25 to malte a tinidftight joint.`

`Connected with the needle passage 17, between the narrow portion 13 andthe threaded portion 19, is an inlet passage 26 into which theunthreaded end of a tube 27 is inserted Which is held in place and madefluid-tight in the passage by means of a packing gland 28 and packing 29of rubber, leather, or other suitable packing material.

` Connected to the lovver end of the tube 27 is a priming device whichis placed at the bottom of a fuel receptacle 3() with an operating stem31 extending through the top of the receptacle Where it is accessibletor operation. Resting on the bottom of the receptacle is a supportingblock 32, the lovver ti (l tom of which a pipe 41 is connected. Be-

f tween the'pipe 41 and the lower end of the tubular member 27is amember 42 formed with a passage 43, in which isa ball valve 44. Theopening of the pipe 41 is below the ball and the tube 2T is connectedabove the Valve.

The upper edge of the block'32 is formed with a shoulder 45 upon which adisk 46 is seated with a connecting fillet 47 of solder,

4or the like, to make a Huidtight joint. Attached to the lowerfend-ofthe stem 31 is a similarsheet metal disk 48, which also has a Huid-tightconnection with the rod. The outer edge 49 of the disk 46 is turnedupwardly, and the outer edge 50 Vof the upper As the disks are made ofsheet material, they have sufficient resilience to permit a considerablecompression at the center thereof. Seated in the chamber 40 is a spring52 which tends to press the upper disk 48 and the rod-31 upwardly, thustending to separate the disks, the disks thus forming a suction chamber53 between them which is contracted by pressing upon the rod 31 andexpanded by the spring 52.

In the ordinary operation of this device the fuel is drawn upwardlythrough the pipe Y 27, through the needle valve and up through Y half orseven` inches. For engines of larger the passage 15 into the chamber 2and out through the passage 4, by the ordinary suction of the engine. Atthe same time air is drawn from priming cup or receptacle 13 which hasits top open to the outside atmosphere through the passages 15 and 16into chamber 2. Air is also drawn into chamber 2 through valve 11. Itwill be apparent that the strength and adjustment of spring 12 is suchthat there will be sufficient resistance to the operation of Valve 11 tocause the engine to suck its fuel up from fuel tank 30, as mentionedaboie. In a carbureter mechanism for an engine of about one-halfhorsepower I- find passages 15 and 16 may be about olie-eighth inch indiameter andthe interior of tube 27 of about the same or slightly largerdiameter. The total height the fuel is to be raised for an engine ofthis sizefshould not be more than six and onesizes these passages would,of course, be iucreased in sizes accordingly. In the priming action thereceptacle 13 is filled, or partially filled with liquid fuel bypressing thc rod 3l one or more times with the needle valve open. Thiscauses fuel to be drawn from the bottom of the receptacle 30 through theball valve in the block 32, the depression of the rod 31 forcing thisball valve closed, but forcing the liquid in the chamber outwardlythrough the pipe 41 and past the ball valve 44 until the liquid isforced past the needle valve into the passage 15 where it iiows throughthe passage 16 into the bottom of the receptacle 13. The suction fromthe engine will draw the necessary fuel from the priming receptacle 13through the passage 15, and after the engine has been started in thismanner, the needle valve may be adjusted into the desired position.

I claim 1. A device for feeding fuel to an internal combustion enginecomprising a carbureter having a mixing chamber and a fuel wcll havingan opening into said mixing chamber above the bottom of the latter; afuel tank below the carbureter; a feed tube connecting the fuel tankwith the fuel well; a priming cup open to the atmosphere outside saidcarbureter and communicating with said fuel well, the' top of thepriming cup being below the opening of said well into said mixingchamber; and manually operable means for forcing fuel through the feedtube into the fuel' well and the priming cup.

2. A device for feeding fuel to an internal combustion engine comprisinga carburetcr having a mixing chamber and a fuel wcll, there being acommunication between the top of said well and the upper portion of saidmixing chamber; a fuel tank below the carbureter; a feed tube connectingthe fuel tank with an intermediate portion of the fuel well; a primingcup open to the outside atmosphere and communicating with the bottom ofsaid feed well, the top of the priming cup being below the top of thewell; and a pump for forcing fuel from the fuel tank to the fuel well.

In testimony whereof I have signed my @name to this specification onthis eighth day of April, A. D. 1918.

HERBERT L. THOMPSON.

